gboolean gdk_events_get_angle ( GdkEvent* event1, GdkEvent* event2, gdouble* angle )
If both events contain X/Y information, this function will return
and return in
angle the relative angle from
event2. The rotation
direction for positive angles is from the positive X axis towards the positive
Available since: 3.0
The data is owned by the caller of the function.
Return location for the relative angle between both events.
The argument will be set by the function.